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                    2.2  变量和常量
            
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                    2.3  Java数据类型
            
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                    2.4  成员变量和局部变量
            
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                    2.5  Java运算符
            
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                    2.6  Java表达式
            
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                    3.1  if语句
            
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                    5.1  String类
            
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                    5.2  String类的常用方法
            
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                    5.3  Java API文档的使用
            
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                    5.4  StringBuffer类
            
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                    第六章    类和对象
            
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                    6.1  类和对象概述
            
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                    6.2  Java类
            
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                    6.4  对象初始化过程
            
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                    6.5  重载
            
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                    第八章    继承和多态
            
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                    8.1  抽象和封装
            
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                    8.2  继承
            
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                    8.3  多态
            
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                    8.4  本章练习
            
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                    第九章    抽象类和接口
            
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                    9.1  抽象类
            
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                    9.2  接口
            
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                    9.3  本章练习
            
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                    第十章    排序算法
            
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                                <h2 id="72--&#x5F15;&#x7528;&#x5305;">7.2  &#x5F15;&#x7528;&#x5305;</h2>
<p>&#x2003;&#x2003;&#x63A5;&#x7740;&#x4E0A;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#xFF0C;&#x5C06;TestPackage.java&#x8C03;&#x6574;&#x4E3A;&#x5982;&#x4E0B;&#x5185;&#x5BB9;&#x3002;</p>
<pre><code>package com.bd.test;

public class TestPackage

{

    public show() 

    {

        System.out.println(&quot;package com.bd.test&quot;);

    }

}
</code></pre><p>&#x2003;&#x2003;&#x5047;&#x8BBE;&#x5728;&#x5F53;&#x524D;&#x76EE;&#x5F55;&#xFF08;&#x5982;&#x56FE;7.1&#x6240;&#x793A;&#x7684;example1&#x76EE;&#x5F55;&#xFF09;&#x4E0B;&#x65B0;&#x5EFA;&#x4E86;&#x4E00;&#x4E2A;Java&#x7A0B;&#x5E8F;TestImport1.java&#xFF0C;&#x5728;&#x7A0B;&#x5E8F;&#x4E2D;&#x9700;&#x8981;&#x65B0;&#x5EFA;&#x4E00;&#x4E2A;TestPackage&#x7C7B;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x5E76;&#x8C03;&#x7528;&#x8BE5;&#x5BF9;&#x8C61;&#x7684;show()&#x65B9;&#x6CD5;&#xFF0C;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code>class TestImport1 

{

    public static void main(String[] args) 

    {

        TestPackage tp = new TestPackage();

        tp.show();

    }

}
</code></pre><p>&#x2003;&#x2003;&#x7F16;&#x8BD1;&#x65F6;&#x4F1A;&#x63D0;&#x793A;&#x9519;&#x8BEF;&#xFF0C;&#x627E;&#x4E0D;&#x5230;TestPackage&#x7C7B;&#x3002;&#x5176;&#x539F;&#x56E0;&#x5728;&#x4E8E;&#xFF0C;TestPackage&#x8FD9;&#x4E2A;&#x7C7B;&#x5DF2;&#x7ECF;&#x88AB;&#x6253;&#x5305;&#x5230;com\bd\test&#x76EE;&#x5F55;&#x4E0B;&#xFF0C;&#x5982;&#x679C;&#x5728;TestImport1&#x4EE3;&#x7801;&#x4E2D;&#x4E0D;&#x505A;&#x4EFB;&#x4F55;&#x64CD;&#x4F5C;&#xFF0C;&#x662F;&#x627E;&#x4E0D;&#x5230;TestPackage&#x7C7B;&#x7684;&#x3002;</p>
<h3 id="721--&#x5B8C;&#x6574;&#x7C7B;&#x540D;&#x5F15;&#x7528;&#x7C7B;">7.2.1  &#x5B8C;&#x6574;&#x7C7B;&#x540D;&#x5F15;&#x7528;&#x7C7B;</h3>
<p>&#x2003;&#x2003;&#x5F15;&#x7528;&#x4E0D;&#x540C;&#x5305;&#x4E2D;&#x7684;&#x7C7B;&#x6709;&#x4E24;&#x79CD;&#x65B9;&#x6CD5;&#xFF0C;&#x5176;&#x4E2D;&#x4E00;&#x79CD;&#x975E;&#x5E38;&#x76F4;&#x89C2;&#x7684;&#x65B9;&#x6CD5;&#x5C31;&#x662F;&#x4F7F;&#x7528;&#x5B8C;&#x6574;&#x7C7B;&#x540D;&#x5F15;&#x7528;&#x7C7B;&#x3002;&#x4F8B;&#x5982;&#xFF0C;&#x5C06;&#x4E0A;&#x9762;TestImport1&#x7C7B;&#x4FEE;&#x6539;&#x4E3A;&#x5982;&#x4E0B;&#x7684;&#x5185;&#x5BB9;&#x3002;</p>
<pre><code>class TestImport2 

{

    public static void main(String[] args) 

    {

        //&#x4F7F;&#x7528;&#x5B8C;&#x6574;&#x5305;&#x540D;&#x5F15;&#x7528;&#x5305;

        com.bd.test.TestPackage tp = new com.bd.test.TestPackage();

        tp.show();

    }

}
</code></pre><p>&#x2003;&#x2003;&#x7F16;&#x8BD1;&#x5E76;&#x8FD0;&#x884C;&#xFF08;&#x8FD0;&#x884C;&#x524D;&#x8981;&#x5C06;EditPlus&#x7684;&#x8FD0;&#x884C;&#x73AF;&#x5883;&#x8C03;&#x6574;&#x56DE;&#x672C;&#x7AE0;&#x4E4B;&#x524D;&#x7684;&#x72B6;&#x6001;&#xFF09;&#x7A0B;&#x5E8F;&#xFF0C;&#x4F1A;&#x6B63;&#x5E38;&#x5730;&#x5728;&#x63A7;&#x5236;&#x53F0;&#x8F93;&#x51FA;&#x201C;package com.bd.test&#x201D;&#x3002;</p>
<h3 id="722--&#x5BFC;&#x5165;&#x5305;">7.2.2  &#x5BFC;&#x5165;&#x5305;</h3>
<p>&#x2003;&#x2003;&#x4F7F;&#x7528;&#x5B8C;&#x6574;&#x7C7B;&#x540D;&#x5F15;&#x7528;&#x7C7B;&#x7684;&#x65B9;&#x6CD5;&#x867D;&#x7136;&#x76F4;&#x89C2;&#xFF0C;&#x4F46;&#x4E66;&#x5199;&#x7684;&#x5185;&#x5BB9;&#x591A;&#xFF0C;&#x4E14;&#x5F53;&#x4F7F;&#x7528;&#x7684;&#x7C7B;&#x6BD4;&#x8F83;&#x591A;&#x65F6;&#xFF0C;&#x7F16;&#x8F91;&#x548C;&#x9605;&#x8BFB;&#x90FD;&#x975E;&#x5E38;&#x56F0;&#x96BE;&#x3002;&#x63A5;&#x4E0B;&#x6765;&#x5B66;&#x4E60;&#x7684;&#x662F;&#x91C7;&#x7528;&#x5BFC;&#x5165;&#x5305;&#x7684;&#x5F62;&#x5F0F;&#x5F15;&#x7528;&#x7C7B;&#xFF0C;&#x5BFC;&#x5165;&#x5305;&#x7684;&#x8BED;&#x6CD5;&#x5F62;&#x5F0F;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code>import &#x5305;&#x540D;.&#x7C7B;&#x540D;;
</code></pre><p>&#x2003;&#x2003;&#x8FD9;&#x91CC;&#x7684;&#x5305;&#x540D;&#x3001;&#x7C7B;&#x540D;&#x65E2;&#x53EF;&#x4EE5;&#x662F;JDK&#x63D0;&#x4F9B;&#x7684;&#x5305;&#x548C;&#x7C7B;&#x7684;&#x540D;&#x79F0;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x662F;&#x7528;&#x6237;&#x81EA;&#x5B9A;&#x4E49;&#x7684;&#x5305;&#x540D;&#x548C;&#x7C7B;&#x540D;&#x3002;</p>
<p>&#x2003;&#x2003;&#x5982;&#x679C;&#x8981;&#x4F7F;&#x7528;&#x4E00;&#x4E2A;&#x5305;&#x4E2D;&#x7684;&#x67D0;&#x4E9B;&#x7C7B;&#xFF0C;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;import &#x5305;&#x540D;.<em>;&#x7684;&#x5F62;&#x5F0F;&#x5BFC;&#x5165;&#x8FD9;&#x4E2A;&#x5305;&#x4E2D;&#x6240;&#x6709;&#x7684;&#x7C7B;&#x3002;&#x4E0D;&#x8FC7;&#xFF0C;&#x5305;&#x7684;&#x5BFC;&#x5165;&#x4E0D;&#x662F;&#x8FED;&#x4EE3;&#x7684;&#xFF0C;&#x5C31;&#x662F;&#x8BF4;&#x5F53;&#x5BFC;&#x5165;java.util.</em>&#x65F6;&#xFF0C;&#x53EA;&#x4F1A;&#x5BFC;&#x5165;java.util&#x5305;&#x4E2D;&#x6240;&#x6709;&#x7684;&#x516C;&#x5171;&#x7C7B;&#xFF0C;&#x4E0D;&#x4F1A;&#x5BFC;&#x5165;&#x8FD9;&#x4E2A;&#x5305;&#x4E0B;&#x5176;&#x4ED6;&#x6587;&#x4EF6;&#x5939;&#x4E2D;&#x7684;&#x7C7B;&#x3002;</p>
<p>&#x2003;&#x2003;&#x53E6;&#x5916;&#xFF0C;import&#x8BED;&#x53E5;&#x9700;&#x8981;&#x653E;&#x5728;package&#x8BED;&#x53E5;&#x540E;&#xFF0C;&#x5728;&#x7C7B;&#x5B9A;&#x4E49;&#x4E4B;&#x524D;&#x3002;</p>
<p>&#x2003;&#x2003;&#x4F8B;&#x5982;&#xFF0C;&#x73B0;&#x5728;&#x9700;&#x8981;&#x901A;&#x8FC7;Java&#x7A0B;&#x5E8F;&#x6C42;&#x51FA;64&#x7684;&#x5E73;&#x65B9;&#x6839;&#x3002;&#x901A;&#x8FC7;&#x67E5;&#x8BE2;JDK API&#xFF0C;&#x627E;&#x5230;java.lang.Math&#x7C7B;&#x6709;&#x4E00;&#x4E2A;sqrt(double a)&#x65B9;&#x6CD5;&#xFF0C;&#x8FD4;&#x56DE;a&#x7684;&#x5E73;&#x65B9;&#x6839;&#xFF0C;&#x5219;&#x5177;&#x4F53;&#x5B9E;&#x73B0;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code>import java.lang.Math;                                                                            //&#x5BFC;&#x5165;java.lang.Math&#x7C7B;&#xFF0C;&#x53EF;&#x4EE5;&#x7701;&#x7565;

class TestImport3

{

    public static void main(String[] args) 

    {

        System.out.println(&quot;64&#x7684;&#x5E73;&#x65B9;&#x6839;&#x4E3A;&#xFF1A;&quot; + Math.sqrt(64)); //&#x4F7F;&#x7528;Math&#x7C7B;&#x7684;sqrt&#x65B9;&#x6CD5;

    }

}
</code></pre><p>&#x2003;&#x2003;&#x7F16;&#x8BD1;&#x3001;&#x8FD0;&#x884C;&#x7A0B;&#x5E8F;&#xFF0C;&#x8F93;&#x51FA;&#x6B63;&#x786E;&#x7ED3;&#x679C;&#xFF1A;8.0&#x3002;</p>
<p>&#x2003;&#x2003;&#x5982;&#x679C;&#x5220;&#x9664;import java.lang.Math;&#x8FD9;&#x6761;&#x8BED;&#x53E5;&#x540E;&#x91CD;&#x65B0;&#x7F16;&#x8BD1;&#x3001;&#x8FD0;&#x884C;&#xFF0C;&#x53D1;&#x73B0;&#x7A0B;&#x5E8F;&#x4ECD;&#x7136;&#x53EF;&#x4EE5;&#x6B63;&#x786E;&#x8F93;&#x51FA;8.0&#x7684;&#x7ED3;&#x679C;&#x3002;&#x4E3A;&#x4EC0;&#x4E48;&#x5462;&#xFF1F;&#x5176;&#x56E0;&#x4E3A;&#x5728;&#x4E8E;&#xFF0C;&#x5BF9;&#x4E8E;java.lang&#x5305;&#x4E2D;&#x7684;&#x6240;&#x6709;&#x516C;&#x5171;&#x7C7B;&#xFF0C;&#x7CFB;&#x7EDF;&#x90FD;&#x9ED8;&#x8BA4;&#x5BFC;&#x5165;&#x5230;&#x7A0B;&#x5E8F;&#x4E2D;&#xFF0C;&#x4E0D;&#x9700;&#x8981;&#x7A0B;&#x5E8F;&#x5458;&#x663E;&#x5F0F;&#x5730;&#x5BFC;&#x5165;&#x3002;</p>
<p>&#x2003;&#x2003;&#x5047;&#x8BBE;&#x73B0;&#x5728;&#x9700;&#x8981;&#x8F93;&#x51FA;&#x5F53;&#x524D;&#x7684;&#x65E5;&#x671F;&#x548C;&#x65F6;&#x95F4;&#x3002;&#x901A;&#x8FC7;&#x67E5;&#x8BE2;JDK API&#xFF0C;&#x627E;&#x5230;java.util.Date&#x7C7B;&#x6709;&#x4E00;&#x4E2A;toString()&#x65B9;&#x6CD5;&#xFF0C;&#x6309;&#x4E00;&#x5B9A;&#x7684;&#x683C;&#x5F0F;&#x8F93;&#x51FA;&#x65E5;&#x671F;&#x548C;&#x65F6;&#x95F4;&#xFF0C;&#x5219;&#x5177;&#x4F53;&#x5B9E;&#x73B0;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code>import java.util.*;                                                                          //&#x5BFC;&#x5165;java.util&#x5305;&#x4E2D;&#x7684;&#x6240;&#x6709;&#x516C;&#x5171;&#x7C7B;&#xFF0C;&#x4E0D;&#x53EF;&#x4EE5;&#x7701;&#x7565;

class TestImport4

{

    public static void main(String[] args) 

    {

        Date now = new Date();

        System.out.println(&quot;&#x73B0;&#x5728;&#x7684;&#x65E5;&#x671F;&#x4E3A;&#xFF1A;&quot; + now.toString());        //&#x4F7F;&#x7528;Date&#x7C7B;&#x7684;toString&#x65B9;&#x6CD5;

    }

}
</code></pre><p>&#x2003;&#x2003;&#x7A0B;&#x5E8F;&#x8FD0;&#x884C;&#x7ED3;&#x679C;&#x5982;&#x56FE;7.6&#x6240;&#x793A;&#x3002;</p>
<center><img src="https://labfile.oss.aliyuncs.com/library/textbook-java1/img/d7z/tu7.6.png"></center>
<center>&#x56FE;7.6  &#x5BFC;&#x5165;&#x5305;&#x8F93;&#x51FA;&#x65E5;&#x671F;</center>  



<p>&#x2003;&#x2003;&#x672C;&#x5C0F;&#x8282;&#x7684;&#x4E24;&#x4E2A;&#x4F8B;&#x5B50;&#x90FD;&#x662F;&#x5BFC;&#x5165;&#x4E86;JDK&#x7C7B;&#x5E93;&#x4E2D;&#x7684;&#x5305;&#xFF0C;&#x63A5;&#x4E0B;&#x6765;&#x4FEE;&#x6539;7.2.1&#x8282;&#x4E2D;&#x4F7F;&#x7528;&#x201C;&#x5B8C;&#x6574;&#x7C7B;&#x540D;&#x5F15;&#x7528;&#x7C7B;&#x201D;&#x7684;&#x4F8B;&#x5B50;&#xFF0C;&#x91C7;&#x7528;&#x5BFC;&#x5165;&#x5305;&#x7684;&#x5F62;&#x5F0F;&#x5F15;&#x7528;&#x7C7B;&#xFF0C;&#x5177;&#x4F53;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code>import com.bd.test.*;                                                  //&#x5BFC;&#x5165;com.bd.test&#x4E2D;&#x6240;&#x6709;&#x7684;&#x516C;&#x5171;&#x7C7B;

class TestImport5 

{

    public static void main(String[] args) 

    {

        TestPackage tp = new TestPackage();     //&#x76F4;&#x63A5;&#x4F7F;&#x7528;&#x5BFC;&#x5165;&#x7684;&#x7C7B;

        tp.show();

}

}
</code></pre>
                                
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